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A Biophysical Framework for Neurodegeneration: Prioritizing Protein Homeostasis Over Aggregate Toxicity
Pitton Rissardo J, Fornari Caprara AL.. Preprints.org, 2025-12-31
Topic: Disease mechanisms in lab and animal studies
Neurodegenerative research has long hypothesized that aggregated proteins such as amyloid‑β (Aβ), tau, and α‑synuclein (αSyn) are intrinsically toxic and are directly associated with the etiologies of Alzheimer’s disease (AD) and Parkinson’s disease (PD). However, emerging scientific evidence challenges this view. Plasma p‑tau217 shows weak correlation with cognitive severity, αSyn seed amplification assays provide only binary diagnostic support, and anti‑amyloid monoclonal antibodies yield modest short-term benefit while increasing amyloid-related imaging abnormality (ARIA) risk. Postmortem pathology and fluid biomarkers explain only a limited amount of variance in clinical outcomes, undermining their role as surrogate endpoints. We propose a biophysical framework in which aggregation reflects a supersaturation-driven phase transition that signals depletion of soluble, functional monomers rather than the emergence of toxic species. Within this paradigm, amyloid plaques, neurofibrillary tangles, and Lewy bodies represent tombstones of lost protein function, and neurodegeneration occurs when monomer supply falls below neuronal demand. This shift has practical implications for biomarker interpretation, staging, and therapeutic design. Future directions include quantifying monomer flux using stable-isotope labeling kinetics (SILK), integrating supply and demand ratios, and prioritizing mechanism-testing trials that restore protein homeostasis rather than indiscriminately clear aggregates. By reframing pathology as a marker of stress rather than a maker of disease, this approach may enable more effective precision therapeutics based on human biology.
Key findings
- Neurodegenerative research has long hypothesized that aggregated proteins such as amyloid‑β (Aβ), tau, and α‑synuclein (αSyn) are intrinsically toxic and are directly associated with the etiologies of Alzheimer’s disease (AD) and Parkinson’s disease (PD).
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Study details
- Evidence strengthLow
How this study scored 16/100
Preprint — not yet peer-reviewed. It scored 19 on the same rubric, but non-peer-reviewed sources are capped at 16, so it shows as 16. Scored zero for study design, sample size, effect reported, studied in people and randomised / blinded because the record does not state it. We have no data on times cited, citations per year, impact for its field and year, cited by studies here, still being cited, senior author's track record, institution's track record and multi-centre collaboration, so those were left out: it earned 12 of the 62 points we could judge it on, which is 19 out of 100.
| Component | Points | Why |
|---|---|---|
| Journal tier | 2 / 10 | Tier 4 — not a peer-reviewed journal (Preprints.org) |
| Journal's citation record | 0 / 4 | Not a journal article, so the journal's record does not count |
| Study design | 0 / 12 | No study design recorded — scores zero, not guessed (not stated in the record — scored 0) |
| Strength of evidence | 1 / 5 | Rated “low” in our summary |
| Peer-review validation | 4 / 10 | Preprint — not yet peer-reviewed. Hosted on a preprint server. |
| How recent | 4 / 5 | 2025 — within 3 year(s) of the newest study here |
| Sample size | 0 / 4 | Participant count not stated — scores zero (not stated in the record — scored 0) |
| Effect reported | 0 / 3 | No effect size reported — scores zero (not stated in the record — scored 0) |
| Studied in people | 0 / 3 | Not stated whether this was studied in people — scores zero (not stated in the record — scored 0) |
| Randomised / blinded | 0 / 2 | No randomisation or blinding stated — scores zero (not stated in the record — scored 0) |
| Times cited | — / 7 | No citation count (not found in OpenAlex) — left out of this score |
| Citations per year | — / 5 | No citation count or no year — left out of this score |
| Impact for its field and year | — / 6 | No field-weighted citation impact (OpenAlex has none yet) — left out of this score |
| Cited by studies here | — / 6 | Not yet checked against this library's citation graph — left out of this score |
| Still being cited | — / 4 | No yearly citation counts — left out of this score |
| Senior author's track record | — / 4 | Senior author's record not available — left out of this score |
| Institution's track record | — / 3 | No institution listed in OpenAlex — left out of this score |
| Multi-centre collaboration | — / 3 | Institutions not listed — left out of this score |
| Indexed in PubMed | 1 / 2 | Not in PubMed, but has a DOI |
| Free to read | 0 / 2 | Behind a paywall — scores zero |
| Points | 12 / 62 | Scored on 12 of 20 parts. We have no data for the rest, so they are left out: 12 of the 62 points we could judge it on is 19 out of 100. |
| Total | 19 / 100 | Capped to 16 because this is not a peer-reviewed article. |
What each of these 20 components measures, and what this score is not →
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Cite this study APA, Vancouver, BibTeX · download .bib or .ris
Built from the record alzhub holds for this paper, not looked up. Volume, issue and page numbers are not held in the record. Check the citation against the original before you use it.
APA 7th
Pitton Rissardo, J., & Fornari Caprara, A. L. (2025). A Biophysical Framework for Neurodegeneration: Prioritizing Protein Homeostasis Over Aggregate Toxicity. Preprints.org. https://doi.org/10.20944/preprints202512.2722.v1
Vancouver
Pitton Rissardo J, Fornari Caprara AL. A Biophysical Framework for Neurodegeneration: Prioritizing Protein Homeostasis Over Aggregate Toxicity. Preprints.org. 2025. doi:10.20944/preprints202512.2722.v1.
BibTeX
@article{pittonrissardo2025-7b94959b,
author = {Pitton Rissardo, J. and Fornari Caprara, A. L.},
title = {{A Biophysical Framework for Neurodegeneration: Prioritizing Protein Homeostasis Over Aggregate Toxicity}},
journal = {Preprints.org},
year = {2025},
doi = {10.20944/preprints202512.2722.v1},
url = {https://doi.org/10.20944/preprints202512.2722.v1}
}
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